The watermark front

Claim (verbatim)

The watermark front. This connects the known takeover of the Islamic paper market by European mills with a datable moving boundary in the codicological record. Watermarked Italian paper displaced Oriental laid paper, but not everywhere at once: it should have swept as a front, arriving earliest where Venetian shipping was cheapest and political resistance weakest, and latest where local mills and inland logistics protected the old stock. Every dated manuscript on watermarked paper is an involuntary timestamp of trade integration, so the crossover date, region by region, reconstructs the front's propagation without a single customs register.

Prediction clause (verbatim)

Dating the 50% crossover (the point at which half of dated manuscripts in a region are on watermarked European paper) yields the strict regional order Balkans/Istanbul, then Syria, then Egypt, then Yemen, then Iran, with the Istanbul-to-Iran gap at least 150 years and Iran's crossover falling after 1700 CE. Primary clause: the ordering with Iran last together with the 150-year-or-greater Istanbul-Iran gap; the verdict follows it.

Kill-dataset (verbatim)

Kill: FIHRIST and vHMML records, which note watermarked versus Oriental laid paper for dated manuscripts across all five regions.

Novelty / leakage triage

provisional — model-triaged, shepherd review pending

A provisional first pass authored by the model (Opus), not yet confirmed by the shepherd. It carries the same dated-search requirements as an authoritative verdict but is excluded from every headline figure and cannot underwrite a prediction until a shepherd confirms it. Provisional reading: Adjacent (closely related prior work exists).

The takeover of the Islamic paper market by European (chiefly Italian) watermarked paper is textbook, and the crossover has been studied region by region -- e.g. a dedicated study of European paper displacing local stock in late-medieval Cairo (c. 1350-1600), while Indo-Persian laid paper persisted into the 20th century (so Iran plausibly last). Not located: the item's front-propagation measurement -- 50%-crossover dates yielding the strict order Balkans/Istanbul -> Syria -> Egypt -> Yemen -> Iran with a >=150-year Istanbul-Iran gap and Iran after 1700 -- reconstructed across FIHRIST/vHMML watermarked-vs-laid records. The takeover and its unevenness are documented; the ordered, dated front as a single measured object is unrun.

• 'Following the Mediterranean Paper Trail: A Study of European Paper in Late Medieval Cairo (c. 1350-1600)', The Library (Oxford) — Region-specific European-paper crossover chronology; the propagation the item would order
• Jonathan M. Bloom, Paper Before Print (2001) -- European watermarked paper vs persistent Indo-Persian laid paper — The takeover narrative and Iran's late persistence; FIHRIST/vHMML records are the kill dataset

Predictions

No prediction registered yet.